Cumulative frequency distribution

Command:

Statistics
Next selectDistribution plot
Next selectCumulative frequency distribution

Description

To obtain a cumulative frequency distribution plot, select Cumulative frequency distribution in the Statistics menu.

Cumulative frequency distribution dialog box

Required input

  • Variable: the variable of interest.
  • Filter: (optionally) a data filter in order to include only a selected subgroup of cases in the graph.
  • Options

    Select a Cumulative frequency polygon (ogive) or a Cumulative dot plot, or both.

    You also have the option to have a cumulative Normal distribution curve displayed together with the cumulative distribution of the data. The cumulative Normal distribution (with Mean and Standard Deviation of the data represented in the graph) curve is displayed as a smooth line. When this option is selected the cumulative frequency distribution (Cumulative frequency polygon and/or Cumulative dot plot) is plotted using a different algorithm, allowing better visual comparison of the observed frequency distribution with the theoretical Normal distribution.
  • Subgroups: click the Subgroups button if you want to identify subgroups in the graph. A new dialog box is displayed in which you can select a categorical variable.

When you have completed the dialog box, click OK to obtain the graph.

Graphs

Cumulative frequency distribution

In the next figures, some combinations of the possible selections are displayed.

Cumulative frequency distribution

Polygon and Normal distribution

Cumulative frequency distribution

Dots and Normal distribution

 

When you want to display the cumulative frequency distribution of several variables in one graph, see Multiple variables graphs.

Literature

  • Altman DG (1991) Practical statistics for medical research. London: Chapman and Hall.

See also

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